Transmitting and dropping sounding reference signals by a wireless device

1. A method comprising:

receiving, by a wireless device, configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups, wherein the cells are in the same timing advance group;

transmitting a first sounding reference signal (SRS) via a first cell of a first PUCCH group in parallel with transmission of a first PUCCH via a second cell of a second PUCCH group; and

dropping, in response to a second PUCCH being transmitted via the first cell in parallel with a configured transmission of a second SRS, the configured transmission of the second SRS via the first cell.

2. The method of claim 1 , wherein the wireless device is not uplink power limited during:

the transmitting the first SRS; and

a timing of the configured transmission of the second SRS.

3. The method of claim 1 , wherein:

the first PUCCH group is a primary PUCCH group and the first cell is a primary cell; and

the second PUCCH group is a secondary PUCCH group and the second cell is a PUCCH secondary cell.

4. The method of claim 1 , further comprising transmitting, in a time interval and via the first PUCCH group, at least one SRS employing a sounding procedure for the first PUCCH group, wherein the sounding procedure:

depends on transmissions, in the time interval, of a PUCCH in the first PUCCH group; and

is independent of transmissions, in the time interval, of a PUCCH in the second PUCCH group.

5. The method of claim 4 , wherein the sounding procedure comprises a first procedure for transmitting one or more SRSs and a second procedure for dropping transmission of one or more SRSs.

6. The method of claim 1 , further comprising transmitting a third SRS via the second cell of the second PUCCH group in parallel with transmission of a third PUCCH via the first cell of the PUCCH first group.

7. The method of claim 1 , wherein the configuration parameters comprises SRS configuration parameters comprising:

an SRS bandwidth parameter; and

an SRS subframe configuration parameter.

8. The method of any of claim 1 , further comprising:

triggering an SRS type 1 transmission in response to the configuration parameters; and

triggering an SRS type 2 transmission in response to downlink control information transmitted on a downlink physical channel.

9. The method of claim 1 , further comprising:

transmitting a third SRS via the first cell of the first PUCCH group in parallel with a first data packet via the second cell of the second PUCCH group; and

dropping a configured transmission of a fourth SRS on the first cell when a second data packet is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.

10. A wireless device comprising:

one or more processors; and

memory storing instructions that, when executed by the one or more processors, cause the wireless device to:

receive configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups, wherein the cells are in the same timing advance group;

transmit a first sounding reference signal (SRS) via a first cell of a first PUCCH group in parallel with transmission of a first PUCCH via a second cell of a second PUCCH group; and

drop, in response to a second PUCCH being transmitted via the first cell in parallel with a configured transmission of a second SRS, the configured transmission of the second SRS via the first cell.

11. The wireless device of claim 10 , wherein the wireless device is not uplink power limited during:

the transmission of the first SRS; and

a timing of the configured transmission of the second SRS.

12. The wireless device of claim 10 , wherein:

the first PUCCH group is a primary PUCCH group and the first cell is a primary cell; and

the second PUCCH group is a secondary PUCCH group and the second cell is a PUCCH secondary cell.

13. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit, in a time interval and via the first PUCCH group, at least one SRS employing a sounding procedure for the first PUCCH group, wherein the sounding procedure:

depends on transmissions, in the time interval, of a PUCCH in the first PUCCH group; and

is independent of transmissions, in the time interval, of a PUCCH in the second PUCCH group.

14. The wireless device of claim 13 , wherein the sounding procedure comprises a first procedure for transmitting one or more SRSs and a second procedure for dropping transmission of one or more SRSs.

15. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to transmit a third SRS via the second cell of the second PUCCH group in parallel with transmission of a third PUCCH via the first cell of the PUCCH first group.

16. The wireless device of claim 10 , wherein the configuration parameters comprises SRS configuration parameters comprising:

an SRS bandwidth parameter; and

an SRS subframe configuration parameter.

17. The wireless device of any of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

trigger an SRS type 1 transmission in response to the configuration parameters; and

trigger an SRS type 2 transmission in response to downlink control information transmitted on a downlink physical channel.

18. The wireless device of claim 10 , wherein the instructions, when executed by the one or more processors, further cause the wireless device to:

transmit a third SRS via the first cell of the first PUCCH group in parallel with a first data packet via the second cell of the second PUCCH group; and

drop a configured transmission of a fourth SRS on the first cell when a second data packet is transmitted via a third cell of the first PUCCH group in parallel with the configured transmission of the second SRS.

19. A system comprising:

a base station comprising:

one or more first processors; and

first memory storing first instructions that, when executed by the one or more first processors, cause the base station to:

transmit configuration parameters of cells grouped into physical uplink control channel (PUCCH) groups, wherein the cells are in the same timing advance group; and

a wireless device comprising:

one or more second processors; and

second memory storing second instructions that, when executed by the one or more second processors, cause the wireless device to:

receive the configuration parameters;

transmit a first sounding reference signal (SRS) via a first cell of a first PUCCH group in parallel with transmission of a first PUCCH via a second cell of a second PUCCH group; and

drop, in response to a second PUCCH being transmitted via the first cell in parallel with a configured transmission of a second SRS, the configured transmission of the second SRS via the first cell.

20. The system of claim 19 , wherein the wireless device is not uplink power limited during:

the transmission of the first SRS; and

a timing of the configured transmission of the second SRS.